<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

<xs:element name="e" />
  <xs:attribute name="a" />
  <xs:complexType name="ct" />
  <xs:simpleType name="st" >
	<xs:restriction base="xs:string"/>
  </xs:simpleType>

  <xs:element name="m2" substitutionGroup="head" />

</xs:schema>